Hi ​@ScottAWebb 

We’re sorry to hear that when sending texts your old number still shows. 

Kindly please try the following steps:

For Android:

• Open Settings - scroll down to About phone.

• Tap SIM status or Phone number.

• If the temporary number is still displayed, restart your phone with the new SIM inserted.

• If it persists, go to Reset network settings (found under System - Reset options). This forces the phone to refresh the ported number.

For iPhone:

Go to Settings.
Tap Phone.
Tap My Number.
Use the delete button to remove the old number.
Use the keypad to enter the new number.
Tap Save.
1. Go to Settings
2. Messages
3. Turn off iMessage.
4. Go to General
5. Reset
6. Reset Network Settings.
7. Once the iPhone is open.
8. Go to Settings
9. Messages Turn ON iMessage.
10.This will recognize the new sim and have it verified.

Thanks, 

Anneline